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Both behaviors are intentional and (for now) configurable.[1][2]

[1] https://www.tenforums.com/tutorials/167068-how-enable-disabl...

[2] https://www.tenforums.com/tutorials/160140-disable-continue-...

Chrome would do that too unless the setting "Continue running background apps when Google Chrome is closed" is turned off.

https://superuser.com/questions/269385/why-does-google-chrom...

Now I never understood why the chrome.exe's would hang out when I didn't install any "background apps" - anyway I suspect a similar setting in Edge is buried in there somewhere.

I have a vague recollection of that being related to embedded browsers in apps, and I think it was related to performance not child processes for unknown client apps.

That's not Edge the browser, but a separate app called Edge WebView2.

Mmm. It was definitely a problem with IE but you did in fact say Edge.